Switch between sculpting brushes
M = Mask Painting
K = Snake Hook Brush
Shift+C = Crease Brush
C = Clay Brush
Shift+T = Flatten/Contrast Brush
L = Layer Brush
G = Grab Brush
I = Inflate/Deflate Brush
P = Pinch/Magnify Brush
S = Smooth Brush  


1 = Blob Brush
2 = Clay Brush
3 = Clay Strips Brush
4 = Crease Brush
5 = Fill/Deepen
6 = Flatten/Contrast Brush
7 = Grab Brush
8 = Inflate/Deflate
9 = Layer Brush
0 = Mask  


Shift+1 = Nudge Brush
Shift+2 = Pinch/Magnify Brush
Shift+3 = Rotate
Shift+4 = Scrape/Peaks
Shift+5 = SculptDraw
Shift+6 = Smooth
Shift+7 = Snake Hook
Shift+8 = Thumb  

Graphic below, slightly outdated. Twist was renamed Rotate and Shift+Number hotkeys re-assigned.



Current as of Blender 2.79a